[Koha] Modifying Search Result layout...

Hello All, I was wondering what should I do in order to be able to modify the layout of the Koha search result item display; i.e. I am using the regular search, I get the hits listed with some details about every hit. I want to modify the content of the "Availability: Copies available for loan: etc..." sentence. I do not want to show the number of copies for every university. I just want them listed with the (2) 2 copies showed between parentheses. What files should I edit and where can they be found? Many thanks, Regards.